![]() However, international programming can require much larger character sets, such as Unicode, so some implementations may use a 16-bit byte or even a 32-bit byte. In the United States, the basic character sets are usually the ASCII and EBCDIC sets, each of which can be accommodated by 8 bits, so the C++ byte is typically 8 bits on systems using those character sets. That is, the number of possible values must equal or exceed the number of distinct characters. A byte contains enough information to store a single ASCII character, like 'h'. Bits are usually assembled into a group of eight to form a byte. Because bits are so small, you rarely work with information one bit at a time. The C++ byte consists of at least enough adjacent bits to accommodate the basic character set for the implementation. A bit can hold only one of two values: 0 or 1, corresponding to the electrical values of off or on, respectively. Byte in this sense is the unit of measurement that describes the amount of memory in a computer, with a kilobyte equal to 1,024 bytes and a megabyte equal to 1,024 kilobytes. "A byte usually means an 8-bit unit of memory. What does that mean? Does it mean implementation of c++ compiler or the processor architecture or some other thing?Īnd I thought a byte is always 8-bit but: Assuming you used the de facto standard of eight bits in one byte, you could calculate the bits of a document by multiplying its byte size by eight. ![]() The idea is to generate a look up for first 256 numbers (one byte), and break every element of array at byte boundary. The following code illustrates simple program to count set bits in a randomly generated 64 K integer array. However, the size of a byte is not defined by any standard. Storing table look up that can handle 2 32 integers will be impractical. However, by design, a codepoint would never need more than one UTF-32 code unit. A codepoint requires 1 to 4 UTF-8 code units. Each code unit provides some of the bits needed for the 21-bit Unicode codepoint. I've read that the bits in a byte (in c++) are implementation or system dependent. How large is a byte The size of a byte depends on the computer hardware. It's called UTF-8 because the code unit is 8 bits.
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